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Modified filler composition, method for making same, pulp and paper using same

a filler composition and composition technology, applied in the field of modified filler composition, can solve the problems of low filler retention, inability to form significant hydrogen bonds with the fiber in the pulp, and inability to effectively bond the negatively charged fiber in the pulp of most filler particles

Inactive Publication Date: 2014-08-07
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a method to make a type of material called NFC, which has high surface area, strength, negative charge and film-forming properties. The NFC is used to modify a filler material and add carboxyl groups and negative charge to its surface. This modified filler is then combined with a cationic polyelectrolyte, which acts as a binder to improve bonding between the filler and the pulp fibers. This results in better levels of filler retention in the paper product.

Problems solved by technology

However, most filler particles can't bond the negatively charged fiber in the pulp effectively.
Furthermore, the surface of the filler generally lacks carboxyl groups and hydroxyl groups, making it unable to form significant hydrogen bonds with the fiber in the pulp.
Therefore, the filler and the fiber have relatively little affinity for each other, which can make the filler retention low.
In addition, filler in the paper may inhibit the bonding of fiber to fiber, thereby reducing the strength of paper.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024]In this embodiment, the modified filler composition was prepared by using NFC having a carboxyl content of about 1.5 mmol / g and PCC, and the NFC had a dry weight of about 0.1% of that of the PCC. Then the modified PCC composition and a cationic starch was added to a Leaf bleached kraft pulp (LBKP) comprising hardwood fibers, wherein the modified PCC composition had a dry weight of about 25% of that of the LBKP, and the cationic starch had a dry weight of about 0.8% of that of the LBKP. The cationic starch was a quaternary ammonium salt type cationic cassava starch having a degree of substitution of 0.01 to 0.3, and the cationic starch was added to the LBKP by directly adding a cationic starch slurry having a concentration of about 1% to the LBKP. Note: All the pulps used in Example 1 and the following Examples 2-12 and comparative Example 1 were produced by Asia Pulp &Paper Co., Ltd.

[0025]A wet paper was made by getting water out of the above LBKP added with the modified PCC c...

example 2

[0028]In this embodiment, the modified filler composition was prepared by using NFC having a carboxyl content of about 1.5 mmol / g and PCC, and the NFC had a dry weight of about 1% of that of the PCC. Then the modified PCC composition and a cationic starch was added to a LBKP, wherein the modified PCC had a dry weight of about 25% of that of the LBKP, and the cationic starch had a dry weight of about 0.8% of that of the LBKP. The cationic starch was a quaternary ammonium salt type cationic cassava starch having a degree of substitution of 0.01 to 0.3, and the cationic starch was added to the LBKP by directly adding a cationic starch slurry having a concentration of about 1% to the LBKP.

[0029]A wet paper was made by getting water out of the above LBKP added with the modified PCC composition and the cationic starch, and the wet paper was dried to be a paper. The paper had a basis weight of 70 g / m2, an ash content of 8.01%, and a filler retention of 34.83%.

example 3

[0030]In this embodiment, the modified filler composition was prepared by using NFC having a carboxyl content of about 1.5 mmol / g and PCC, and the NFC had a dry weight of about 5% of that of the PCC. Then the modified PCC composition and a cationic starch was added to a LBKP, wherein the modified PCC had a dry weight of about 25% of that of the LBKP, and the cationic starch had a dry weight of about 0.8% of that of the LBKP. The cationic starch was a quaternary ammonium salt type cationic cassava starch having a degree of substitution of 0.01 to 0.3, and the cationic starch was added to the LBKP by directly adding a cationic starch slurry having a concentration of about 1% to the LBKP.

[0031]A wet paper was made by getting water out of the above LBKP added with the modified PCC composition and the cationic starch, and the wet paper was dried to be a paper. The paper had a basis weight of 70 g / m2, an ash content of 12.30%, and a filler retention of 56.1%.

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Abstract

A modified filler composition used in papermaking is provided. The modified filler composition contains nanofibrillated cellulose having a carboxyl content of about 0.05 to about 1.5 mmol / g, and filler having positive charge.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of priority to People's Republic of China Patent Application No. 201310047279.4, filed Feb. 5, 2013, which is hereby incorporated by reference herein in its entirety.BACKGROUND[0002]1. Technical Field[0003]The present disclosure relates to a modified filler composition used in the field of papermaking, a method for making the modified filler composition, and a pulp and a paper using the modified filler composition.[0004]2. Description of Related Art[0005]In the field of papermaking, adding filler to the paper pulp can effectively lower the cost. However, most filler particles can't bond the negatively charged fiber in the pulp effectively. Furthermore, the surface of the filler generally lacks carboxyl groups and hydroxyl groups, making it unable to form significant hydrogen bonds with the fiber in the pulp. Therefore, the filler and the fiber have relatively little affinity for each other, which can mak...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H17/25D21H17/67D21H17/68
CPCD21H17/25D21H17/68D21H17/675D21H11/18
Inventor F. CHIN, YUNGCHANGFU, KE-CHENGWANG, CUI-XIAMA, PUWANG, REN-RONG
Owner GOLD EAST PAPER JIANGSU
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